Revision as of 06:25, 16 May 2022

Pico-2CH-RS232

2-Channel RS232 Module for Raspberry Pi Pico, SP3232EEN Transceiver, UART To RS232

Overview

Provide Pico C demo.

Specifications

Operating voltage: 3.3V~5V
RS232 Transceiver: SP3232EEN
Communication bus: UART
Baud rate: 300 ~ 912600bps
Dimension: 21.00（H）x 52.00（V） mm

Pinout

Controller

The SP3232E series is a solution for RS232 transceivers for portable or handheld applications such as notebooks or PDAs. the SP3222E/3232E series has a highly efficient charge pump that requires only 0.1F capacitance for operation at an operating voltage of 3.3V.

Pico User Guide

Hardware connection

When connecting PICO, please pay attention not to connect in the opposite direction. The direction can be judged by observing the USB screen printing end of the module and the USB interface of the Pico (also can be judged by the pin label of the platoon master on the module and the pin label of the Pico).
You can also wire it according to the table below:


RS485	Pico	Description
VCC	VSYS	Power input
GND	GND	Ground
TXD0	GP0	UART transmit pin
RXD0	GP1	UART receive pin
TXD1	GP4	UART transmit pin
RXD1	GP5	UART receive pin

Connection

The connection of the RS485 board is the same as the Pico-2CH-RS232.

Setup environment

To setup the Pico for working, please refer to the official guide: https://www.raspberrypi.org/documentation/pico/getting-started/

Download example

Open a terminal and run the follow command

sudo apt-get install p7zip-full
cd ~
sudo wget  https://files.waveshare.com/upload/6/6a/Pico_2CH_RS232_Code.7z
7z x Pico_2CH_RS232_Code.7z -o.
cd ~/Pico_2CH_RS232_Code
cd C/build/

Run the examples

C codes

The following tutorials are operated on the Raspberry Pi, but as CMake has multi-platforms and is portable, it can be successfully compiled on the PC, but the operation is slightly different, and you need to judge by yourself.

To compile, make sure you are in the c directory:

cd ~/Pico_2CH_RS232_Code/c/

Create the build folder and add the SDK path to it:
By default, the ../../pico-sdk is the path of SDK.
We have created the build folder in examples, you can just enter it.
Note: If the actual path of your Pi is different, you need to write the correct path.

cd build
export PICO_SDK_PATH=../../pico-sdk

Run the cmake to generate Makefile file.

cmake ..

Run the make command to build the codes and generate an executable file.

make -j9

After building, an uf2 file is generated. Press and hold the key on the Pico board to connect the Pico to the Raspberry Pi's USB port via the Micro USB cable, then release the key. Once connected, Raspberry will automatically recognize a removable disk (RPI-RP2). Copy the file main.uf2 in the corresponding folder to the recognized removable disk (RPI-RP2).

cp main.uf2 /media/pi/RPI-RP2/

Python codes

Use in Windows

1. Press and hold the BOOTSET button on the Pico board, connect the pico to the USB port of the computer through the Micro USB cable, and release the button after the computer recognizes a removable hard disk (RPI-RP2).
2. Copy the rp2-pico-20210418-v1.15.uf2 file in the python directory to the recognized removable disk (RPI-RP2).
3. Open Thonny IDE (Note: Use the latest version of Thonny, otherwise there is no Pico support package, the latest version under Windows is v3.3.3).
4. Click Tools->Settings->Interpreter, select Pico and the corresponding port as shown in the figure.

5. File -> Open -> the corresponding .py file, click to run, as shown in the following figure:

This demo provides a simple program...

Run in Raspberry Pi

Hold the BOOTSET key of Pico board, then connect the Pico to Raspberry Pi by USB cable, then release the key.
Once the removable disk (RPI-RPI2) is recognized, copy the rp2-pico-20210418-v1.15.uf2 file to pico.
Open the Thonny IDE in Raspberry Pi, update it if it doesn't support Pico
Configure the port by choosing MicroPython(Raspberry Pi and ttyACM0 port) in Tools -> Options... -> Interpreter

If your Thonny doesn't support Pico, you can update it with the following command:

sudo apt upgrade thonny

Choose File->Open...->python/ and select the corresponding .py file to run the codes

Documents

Demo Codes

Demo code

Support

If you require technical support, please go to the Support page and open a ticket.

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